Lifting-jack



' PATENTED JAN. 5, 1904. w. 01 SMITH. I LIPTING JACK.

APPLICATION FILED MAR. 27. 1903.

I No. 748,992.

Patented January 5, 1904.

PATENT OFFICE.

WILLIAM 0. SMITH, OF CHICAGO, ILLINOIS.

LlFTlNG-JAC K.

SPECIFICATION forming part of Letters Patent No. 748,992, dated January 5, 1904.

Application filed March 27, 1903.

' To all whom it may concern:

Be it known that I, WILLIAM 0. SMITH, a citizen of the United States, residing at Ohicago, in the county of Cook and State of Illinois, have invented anew and useful Lifting- Jack, of which the following is a specification.

This invention relates to certain improvements in lifting-jacks, and has for its object to provide a simple, inexpensive, and efficient device of this character composed of few parts and capable of lifting and supporting in an elevated position heavy bodies with a minimum expenditure of power.

A further object of the invention is to provide a novel form of head whereby the jack may be more readily adjusted to carriageaxles, preventing the same from slipping while being elevated, and, further, to provide an extremely simple means for holding the jack in its elevated position without the use of racks, catches, pins, or other expensive retaining devices.

The invent-ion consists in the construction and novel combination and arrangements ofv parts hereinafter fully described, illustrated in the accompanying drawings, and pointed out in the claimshereto appended, it being understood that variouschanges in form, pro-,

portions, and minor details of construction may be resorted to without departing from the spirit orsacrificing any of the advantages of this invention.

In the accompanying drawings, Figure 1 is a perspective view of a lifting-jack constructed in accordance with my invention. Fig. 2 is a side elevation, partly in section, of the head and a portion of the operating-lever.

Similar numerals of reference indicate corresponding parts in all the figures of the drawmgs.

The jack may be formed of wood or other suitable material and has a frame comprising a pair of spaced parallel uprights 1, carrying a pivot-bolt 2, the uprights being supported by a foot or base piece 3, interposed between said uprights at the lower ends thereof and secured thereto in any suitable manner, as by bolts 5 or similar fastening devices. Between the two uprights and resting on the bolt 2 is a lever 6. A head 7, formed of metal or other suitable material, preferably forged or cast, is secured to the short Serial No. 149,896- (No model.)

arm of the lever 6, and said head is provided with a stepped face defining one or more horizontally-disposed shoulders 8, provided with vertically-disposed ribs 9, the upper end of the head terminating in a pair of rearwardlyextending parallel flanges 10, forming a socket for the reception of'the end of the lever 6, said lever being secured therein by means of a bolt 11 or similar fastening device passing through coincident openings formed in said flanges and the lever.

The casting or head 7 is provided with an upwardly and rearwardly extending curved supporting-arm 12, having a transverselydisposed groove or channel 13, formed in the end thereof adapted to receive the pivotal bolt 2, said arm being also provided with an upwardly-projecting pin or lug 14, which fits in a corresponding socket'in the lever 6. Secured to long arm of the lever 6, at a point adjacent the rear end thereof, is a staple 15, adapted to receive an eye formed in the end of a bar or rod 16, the opposite end of which passes between the parallel uprights 2, being provided with laterally-extending arms 17, having sharp edges 18, which bite into the front edges of the uprights and securely hold the jack in the adjusted position.

If the vehicle-axle or other object to be elevated is quite low, the shoulder on the lower end of the head is applied thereto and the lever 6 depressed in'the usual manner to lift the load, the vertical rib preventing the displacement of the axle. The moment the hand is removed from the lever the weight of the supported load will cause the long arm of the lever 4 to tilt upwardly, pulling on the rod 16 and causing the sharp edges of the arms to bite into the uprights and securely hold the jack in its adjusted position. If the axle should be a little higher, the next shoulder in the head is brought into play, the end of the rod 16 in each instance engaging the uprights and supporting the jack in the adjusted position without the use of catches, racks, pins, or other expensive retaining devices.

The construction and arrangement of the parts is such that the lifting strain is borne by the pivot, and the whole thickness of the lever is interposed between the load and pivot, thus strengthening the lever materially and permitting the lifting of heavier loads than is possible with levers in which an opening is formed for the pivot-bolt. When in use, a load on any one of the steps is thrown directly on the end of the lever, and there is also a rearward thrust on the head, which is resisted partly by the pivot-bolt and partly by the pin 14.

From the foregoing description it will be seen that I have provided an exceedingly inexpensive and efficient jack, which is simple in construction and eflective in operation, the relative disposition of the several parts being such that the adjusting-rod automatically ongages the uprights the moment the load is free to operate the lever, securely locking the same, while the axle or other object to be elevated is prevented from being accidently displaced by the vertically-disposed ribs.

Having thus described the invention, what I claim, and desire to secure by Letters Patent, is

1. Alifting-jack comprisingapair of spaced uprights, a pivot-pin carried thereby, a lever supported between the uprights and resting on the pin, and a stepped head secured to the lever and provided with a groove or socket adapted to receive the pivot-pin.

2. A lifting-jack comprising a base, a pair of spaced uprights secured to the base, a pivot-pin carried by the uprights, a lever supported between said uprights and resting on the pivot-pin, said lever being provided with a detachable stepped head, a socket formed in the head having a groove or recess adapted to receive the pin adapted to receive the end of the lever, and means for locking the lever in adjusted position.

3. In a lifting-jack the combination of the spaced uprights, a pivot-pin carried thereby, a lever resting on the pivot-pin, and a stepped head carried by the lever and having a rearwardly-extended grooved arm embracing the pivot-pin and secured to the under side of said lever.

4. A lifting-jack comprising a base, a pair of spaced uprights secured to the base, a pivot-pin carried by the uprights, a lever supported between said upright-s and resting on the pivot-pin, a head secured to the lever and provided with horizontally-disposed shoulders having upwardly-extending ribs formed thereon, said head being provided with a groove or socket adapted to receive the pivotpin and a rod one end of which is pivoted to the long arm of the lever the opposite end of said rod passing between the uprights and engaging the front faces thereof.

5. A lifting-jack comprising a base, a pair of spaced uprights secured to the base, a lever pivotally supported between the uprights, a stepped head secured to the lever and provided with a su pporting-arm having a groove or channel in the end thereof, a bolt passing through said groove and openings in the uprights, and a locking-bar pivoted to the long arm of the lever and adapted to engage the uprights.

6. A lifting-jack comprising a base, a pair of spaced uprights secured to the base, a. lever pivotally supported between the uprights, a stepped head provided with a socket adapted to receive the short arm of the lever, a bolt passing through said socket and lover, said head being provided with a rearwardly-extending supporting-arm having a groove or channel formed therein and provided with an upwardly-extending terminal lug fitting in a corresponding socket in the lever, a bolt passing through the groove and coincident openings in the uprights, and a locking-bar one end of which is pivoted to the long arm of the lever the opposite end thereof extending between the uprights and engaging the front edges thereof.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two witnesses.

WILLIAM C. SMITH.

Witnesses:

E. F. OoNKLIN, E. HILKER. 

